1 /* $OpenBSD: dh_ameth.c,v 1.12 2014/07/12 16:03:37 miod Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 2006. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/asn1.h> 62 #include <openssl/bn.h> 63 #include <openssl/dh.h> 64 #include <openssl/err.h> 65 #include <openssl/x509.h> 66 67 #include "asn1_locl.h" 68 69 static void 70 int_dh_free(EVP_PKEY *pkey) 71 { 72 DH_free(pkey->pkey.dh); 73 } 74 75 static int 76 dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) 77 { 78 const unsigned char *p, *pm; 79 int pklen, pmlen; 80 int ptype; 81 void *pval; 82 ASN1_STRING *pstr; 83 X509_ALGOR *palg; 84 ASN1_INTEGER *public_key = NULL; 85 DH *dh = NULL; 86 87 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) 88 return 0; 89 X509_ALGOR_get0(NULL, &ptype, &pval, palg); 90 91 if (ptype != V_ASN1_SEQUENCE) { 92 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR); 93 goto err; 94 } 95 96 pstr = pval; 97 pm = pstr->data; 98 pmlen = pstr->length; 99 100 if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) { 101 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); 102 goto err; 103 } 104 105 if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) { 106 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); 107 goto err; 108 } 109 110 /* We have parameters now set public key */ 111 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) { 112 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR); 113 goto err; 114 } 115 116 ASN1_INTEGER_free(public_key); 117 EVP_PKEY_assign_DH(pkey, dh); 118 return 1; 119 120 err: 121 if (public_key) 122 ASN1_INTEGER_free(public_key); 123 DH_free(dh); 124 return 0; 125 } 126 127 static int 128 dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) 129 { 130 DH *dh; 131 int ptype; 132 unsigned char *penc = NULL; 133 int penclen; 134 ASN1_STRING *str; 135 ASN1_INTEGER *pub_key = NULL; 136 137 dh=pkey->pkey.dh; 138 139 str = ASN1_STRING_new(); 140 if (str == NULL) { 141 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); 142 goto err; 143 } 144 145 str->length = i2d_DHparams(dh, &str->data); 146 if (str->length <= 0) { 147 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); 148 goto err; 149 } 150 ptype = V_ASN1_SEQUENCE; 151 152 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL); 153 if (!pub_key) 154 goto err; 155 156 penclen = i2d_ASN1_INTEGER(pub_key, &penc); 157 158 ASN1_INTEGER_free(pub_key); 159 160 if (penclen <= 0) { 161 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); 162 goto err; 163 } 164 165 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH), ptype, 166 (void *)str, penc, penclen)) 167 return 1; 168 169 err: 170 free(penc); 171 ASN1_STRING_free(str); 172 173 return 0; 174 } 175 176 /* 177 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in 178 * that the AlgorithmIdentifier contains the paramaters, the private key 179 * is explcitly included and the pubkey must be recalculated. 180 */ 181 182 static int 183 dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) 184 { 185 const unsigned char *p, *pm; 186 int pklen, pmlen; 187 int ptype; 188 void *pval; 189 ASN1_STRING *pstr; 190 X509_ALGOR *palg; 191 ASN1_INTEGER *privkey = NULL; 192 DH *dh = NULL; 193 194 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) 195 return 0; 196 197 X509_ALGOR_get0(NULL, &ptype, &pval, palg); 198 199 if (ptype != V_ASN1_SEQUENCE) 200 goto decerr; 201 202 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen))) 203 goto decerr; 204 205 pstr = pval; 206 pm = pstr->data; 207 pmlen = pstr->length; 208 if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) 209 goto decerr; 210 /* We have parameters now set private key */ 211 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) { 212 DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR); 213 goto dherr; 214 } 215 /* Calculate public key */ 216 if (!DH_generate_key(dh)) 217 goto dherr; 218 219 EVP_PKEY_assign_DH(pkey, dh); 220 221 ASN1_INTEGER_free(privkey); 222 223 return 1; 224 225 decerr: 226 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR); 227 dherr: 228 DH_free(dh); 229 return 0; 230 } 231 232 static int 233 dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) 234 { 235 ASN1_STRING *params = NULL; 236 ASN1_INTEGER *prkey = NULL; 237 unsigned char *dp = NULL; 238 int dplen; 239 240 params = ASN1_STRING_new(); 241 242 if (!params) { 243 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); 244 goto err; 245 } 246 247 params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data); 248 if (params->length <= 0) { 249 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); 250 goto err; 251 } 252 params->type = V_ASN1_SEQUENCE; 253 254 /* Get private key into integer */ 255 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL); 256 257 if (!prkey) { 258 DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR); 259 goto err; 260 } 261 262 dplen = i2d_ASN1_INTEGER(prkey, &dp); 263 264 ASN1_INTEGER_free(prkey); 265 prkey = NULL; 266 267 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0, 268 V_ASN1_SEQUENCE, params, dp, dplen)) 269 goto err; 270 271 return 1; 272 273 err: 274 free(dp); 275 ASN1_STRING_free(params); 276 ASN1_INTEGER_free(prkey); 277 return 0; 278 } 279 280 static void 281 update_buflen(const BIGNUM *b, size_t *pbuflen) 282 { 283 size_t i; 284 285 if (!b) 286 return; 287 if (*pbuflen < (i = (size_t)BN_num_bytes(b))) 288 *pbuflen = i; 289 } 290 291 static int 292 dh_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen) 293 { 294 DH *dh; 295 296 if (!(dh = d2i_DHparams(NULL, pder, derlen))) { 297 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB); 298 return 0; 299 } 300 EVP_PKEY_assign_DH(pkey, dh); 301 return 1; 302 } 303 304 static int 305 dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder) 306 { 307 return i2d_DHparams(pkey->pkey.dh, pder); 308 } 309 310 static int 311 do_dh_print(BIO *bp, const DH *x, int indent, ASN1_PCTX *ctx, int ptype) 312 { 313 unsigned char *m = NULL; 314 int reason = ERR_R_BUF_LIB, ret = 0; 315 size_t buf_len = 0; 316 const char *ktype = NULL; 317 BIGNUM *priv_key, *pub_key; 318 319 if (ptype == 2) 320 priv_key = x->priv_key; 321 else 322 priv_key = NULL; 323 324 if (ptype > 0) 325 pub_key = x->pub_key; 326 else 327 pub_key = NULL; 328 329 update_buflen(x->p, &buf_len); 330 331 if (buf_len == 0) { 332 reason = ERR_R_PASSED_NULL_PARAMETER; 333 goto err; 334 } 335 336 update_buflen(x->g, &buf_len); 337 update_buflen(pub_key, &buf_len); 338 update_buflen(priv_key, &buf_len); 339 340 if (ptype == 2) 341 ktype = "PKCS#3 DH Private-Key"; 342 else if (ptype == 1) 343 ktype = "PKCS#3 DH Public-Key"; 344 else 345 ktype = "PKCS#3 DH Parameters"; 346 347 m= malloc(buf_len + 10); 348 if (m == NULL) { 349 reason = ERR_R_MALLOC_FAILURE; 350 goto err; 351 } 352 353 BIO_indent(bp, indent, 128); 354 if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0) 355 goto err; 356 indent += 4; 357 358 if (!ASN1_bn_print(bp, "private-key:", priv_key, m, indent)) 359 goto err; 360 if (!ASN1_bn_print(bp, "public-key:", pub_key, m, indent)) 361 goto err; 362 363 if (!ASN1_bn_print(bp, "prime:", x->p, m, indent)) 364 goto err; 365 if (!ASN1_bn_print(bp, "generator:", x->g, m, indent)) 366 goto err; 367 if (x->length != 0) { 368 BIO_indent(bp, indent, 128); 369 if (BIO_printf(bp, "recommended-private-length: %d bits\n", 370 (int)x->length) <= 0) 371 goto err; 372 } 373 374 ret = 1; 375 if (0) { 376 err: 377 DHerr(DH_F_DO_DH_PRINT,reason); 378 } 379 free(m); 380 return(ret); 381 } 382 383 static int 384 int_dh_size(const EVP_PKEY *pkey) 385 { 386 return DH_size(pkey->pkey.dh); 387 } 388 389 static int 390 dh_bits(const EVP_PKEY *pkey) 391 { 392 return BN_num_bits(pkey->pkey.dh->p); 393 } 394 395 static int 396 dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) 397 { 398 if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) || 399 BN_cmp(a->pkey.dh->g, b->pkey.dh->g)) 400 return 0; 401 else 402 return 1; 403 } 404 405 static int 406 dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) 407 { 408 BIGNUM *a; 409 410 if ((a = BN_dup(from->pkey.dh->p)) == NULL) 411 return 0; 412 BN_free(to->pkey.dh->p); 413 to->pkey.dh->p = a; 414 415 if ((a = BN_dup(from->pkey.dh->g)) == NULL) 416 return 0; 417 BN_free(to->pkey.dh->g); 418 to->pkey.dh->g = a; 419 420 return 1; 421 } 422 423 static int 424 dh_missing_parameters(const EVP_PKEY *a) 425 { 426 if (!a->pkey.dh->p || !a->pkey.dh->g) 427 return 1; 428 return 0; 429 } 430 431 static int 432 dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) 433 { 434 if (dh_cmp_parameters(a, b) == 0) 435 return 0; 436 if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0) 437 return 0; 438 else 439 return 1; 440 } 441 442 static int 443 dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) 444 { 445 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0); 446 } 447 448 static int 449 dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) 450 { 451 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1); 452 } 453 454 static int 455 dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) 456 { 457 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2); 458 } 459 460 int 461 DHparams_print(BIO *bp, const DH *x) 462 { 463 return do_dh_print(bp, x, 4, NULL, 0); 464 } 465 466 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = { 467 .pkey_id = EVP_PKEY_DH, 468 .pkey_base_id = EVP_PKEY_DH, 469 470 .pem_str = "DH", 471 .info = "OpenSSL PKCS#3 DH method", 472 473 .pub_decode = dh_pub_decode, 474 .pub_encode = dh_pub_encode, 475 .pub_cmp = dh_pub_cmp, 476 .pub_print = dh_public_print, 477 478 .priv_decode = dh_priv_decode, 479 .priv_encode = dh_priv_encode, 480 .priv_print = dh_private_print, 481 482 .pkey_size = int_dh_size, 483 .pkey_bits = dh_bits, 484 485 .param_decode = dh_param_decode, 486 .param_encode = dh_param_encode, 487 .param_missing = dh_missing_parameters, 488 .param_copy = dh_copy_parameters, 489 .param_cmp = dh_cmp_parameters, 490 .param_print = dh_param_print, 491 492 .pkey_free = int_dh_free, 493 }; 494